SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 AC1

2020 AC1

2020 AC1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.86 AU and a period of 0.80 yr.

Aten Observations: 70
Orbital Period · P
0.80 yr
v(q)
40.2 km/s
v(Q)
25.7 km/s
Diameter · ≈
0.01 km
TJ
6.84
Eccentricity · e
0.2203

Orbit and dynamics

The path is an ellipse reaching 0.671 AU from the Sun at perihelion and 1.05 AU at aphelion, a radial span of 0.379 AU.

Applying Kepler's third law to a = 0.86 AU gives an orbital period of 0.80 yr, or about 291 days.

An eccentricity of 0.22 makes the orbit moderately elongated.

The orbital plane is tilted 5.98° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 40.2 km/s at perihelion and falls to 25.7 km/s at aphelion.

Because q < 1 AU and Q > 1 AU, this orbit geometrically intersects the region of Earth's orbit.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 28.39 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 70 observations and has a weighted RMS residual of 0.3747 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

About these computed values

Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Orbital Parameters

Semi-Major Axis
0.8602 AU
Eccentricity
0.2203
Perihelion
0.671 AU
Aphelion
1.049702 AU
Inclination
5.98°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
144.84°

Orbit diagram

The Sun sits at the focus (orange). Earth's orbit is the grey circle at 1 AU. The red dot marks the object's position at the catalog epoch.

3D orbit (interactive)

Drag to rotate; scroll or pinch to zoom. The Sun is at the focus (orange), Earth's orbit is the grey ring at 1 AU, and the red dot marks the object's current position.

Close approaches

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2028-Jan-31 23:51 0.080864 AU
12097051 km
5.17 km/s
2031-Nov-05 23:42 0.228261 AU
34147288 km
4.20 km/s
2032-Mar-01 05:01 0.098233 AU
14695472 km
5.15 km/s
2035-Oct-14 08:23 0.274365 AU
41044492 km
6.87 km/s
2036-Mar-18 03:25 0.103477 AU
15480010 km
6.99 km/s
2039-Sep-27 03:51 0.306626 AU
45870523 km
8.69 km/s
2040-Mar-18 22:17 0.154700 AU
23142860 km
10.03 km/s
2044-Mar-16 06:32 0.133264 AU
19936008 km
13.01 km/s
2074-Dec-30 04:45 0.004712 AU
704867 km
7.44 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
28.39

Orbit Quality

RMS
0.37474
Condition
6
Orbit ID
—
Data source: NASA JPL Small-Body Database · NASA CNEOS. Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

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